Abstract
Auxins are the only compounds used in commercial plant propagation to stimulate rooting, although efforts have been made to find other efficient compounds. Another group of rooting promoters could be plant growth retardants (PGRs) which act as inhibitors of gibberellin synthesis. The aim of the experiment was to determine the effect of flurprimidol and naphthalene-1-acetic acid (NAA) applied by quick-dip method on rooting and development of <em>Fuchsia hybrida</em> 'Swingtime' cuttings and their subsequent growth. Anatomical analysis of the rooting process was also done. Flurprimidol and NAA did not influence the percentage of rooted fuchsia cuttings but increased the number of adventitious roots. Both compounds were involved in earlier formation of root primordia. Flurprimidol and NAA, used simultaneously or separately, increased the number and length of axillary shoots of fuchsia cuttings. The effect of flurprimidol on the number of roots and shoots was stronger than that of NAA, but diminished after transplanting the rooted cuttings. The influence of flurprimidol on axillary shoot length was weaker as its concentration increased.
Highlights
The economical success of ornamental horticulture depends on production of plants of the highest quality in the shortest time of production
There was no significant difference between the effect of flurprimidol and flurprimidol combined with naphthalene-1-acetic acid (NAA)
In shoots treated with flurprimidol at 0.075 g dm-3, the first primordia emerged after 6 days of rooting (Fig. 1), and after 5 days as a result of flurprimidol application at 0.15 g dm-3 (Fig. 2), whereas the same stage of primordium formation in NAA-treated cuttings was observed after 4 days (Fig. 3)
Summary
The economical success of ornamental horticulture depends on production of plants of the highest quality in the shortest time of production. Auxins have been the main promoters of rooting of cuttings (Hartmann et al 2002), there have been made efforts to find other efficient compounds. Another group of compounds stimulating rooting are plant growth retardants (PGRs) (Davis and Sankhla , 1988), but they are not commercially used for this purpose. They act as inhibitors of gibberellin synthesis, suppress elongation of shoot internodes. Apart from PGR concentration, their effectiveness depends on a number of factors, including the method of application, their persistence and plant response
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